Process of reducing refractory oxids.



KARL AUGUST xiinnnfor DRESDENMGERMAIYY.

PROCESS OF REDUCING REFRACTORY OXIDS.

Specification of Letters Patent.

Patented July 23, 1907.

' Application filed April 3, 1906, Serial No. 309,677- Renewe d May 16, 1907. Serial No. 373.977-

To all whom it may concern:

Be it known that I, KARL AUGUST KUHNE, a subject of the King of Saxony, residing at Dresden, Pohland-' strasse 20, in the German Empire, have invented certain new and useful Improvements in Processes of Reducing Refractory Oxids, of which the following is a full, clear, and exact description.

This invention relates to a process for the production or isolation of metals, metalloids or their alloys with aluminium and is based upon the fact that those metals, motalloids, or alloys, which cannot be produced or isolated separately in reguline form by what is known as the Goldschrnidt or the Thermite process, can be -rcduced or isolated by aluminium and chlorate of potash, or other similar bodies, without the application of external heat. 1

An oxid or other compound of the metal or metalloid it is intended to produce or isolate, boron for example, is mixed with aluminium and a chlorate such as potassium chlorate, sodium chlorate or ammonium chlorate for example all three being finely powdered. This mixture is placed in a crucible and the contents ignited; The ignition may be effected by touching the mixture with a red-hot body, such as a red-hot iron rod or strip of magnesium for example. The mixture begins to burn and melts together at a white heat into a thin liquid boiling mass, which consists, after cooling,

other circumstances it is not possible to give fixed proportions of the component parts of the mixture; but taking the production of boron as an example, the following mixture has been proved to yield good results, namely: 2 parts of finely divided aluminium, 5 parts of chlorate of potash, or similarly acting material, and 3 parts of a compound of boron.

What I claim as my invention and desire to secure by Letters Patent is:

The process for the reduction of refractory oxids, which consists in mixing them with aluminium and chlorate of ,an alkali metal, and then igniting the mixture, substantially as described.

In witness whereof, 1' subscribe my signature, in presence of two witnesses.

KAR-L AUGUST Ki'IHNE.

Witnesses:

PAUL E. SCHILLING, Cmmme II. Scnrnnnm. 

